/* Nền tổng thể */

body {
    background: url('sources/base64-16831973908311976930857.png') no-repeat center center fixed;
    background-size: cover;
    color: #f1f1f1;
    font-family: 'Poppins', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    scroll-behavior: smooth;
}


/* Làm mờ nền */

body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: -1;
}


/* Bố cục chính */

.content-container {
    display: flex;
    padding-top: 100px;
}


/* Sidebar */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: linear-gradient(135deg, rgba(10, 10, 10, 0.95), rgba(20, 20, 20, 0.9));
    backdrop-filter: blur(15px) saturate(120%);
    padding: 100px 15px 30px 15px;
    overflow-y: auto;
    border-right: 2px solid rgba(212, 175, 55, 0.3);
    box-shadow: 4px 0 25px rgba(0, 0, 0, 0.5);
    transform: translateX(-100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.4s ease;
    z-index: 999;
    opacity: 0;
}

.sidebar.active {
    transform: translateX(0);
    opacity: 1;
}

.sidebar.closing {
    transform: translateX(-100%);
    opacity: 0;
}

.sidebar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #d4af37, #daa520, #d4af37);
    background-size: 200%;
    animation: shimmer 3s infinite linear;
}

@keyframes shimmer {
    0% {
        background-position: 200% 0;
    }
    100% {
        background-position: -200% 0;
    }
}

.sidebar ul {
    list-style: none;
    padding-left: 0;
    margin-top: 20px;
}

.sidebar li {
    margin: 8px 0;
    animation: fadeInUp 0.6s ease backwards;
}

.sidebar li:nth-child(1) {
    animation-delay: 0.1s;
}

.sidebar li:nth-child(2) {
    animation-delay: 0.2s;
}

.sidebar li:nth-child(3) {
    animation-delay: 0.3s;
}

.sidebar li:nth-child(4) {
    animation-delay: 0.4s;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sidebar a {
    display: block;
    color: #e8d5a0;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    padding: 14px 18px;
    border-radius: 12px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 1px solid transparent;
    background: rgba(255, 255, 255, 0.02);
}

.sidebar a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: linear-gradient(180deg, #d4af37, #daa520);
    transform: scaleY(0);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 0 4px 4px 0;
}

.sidebar a::after {
    content: '';
    position: absolute;
    top: 50%;
    right: 18px;
    transform: translateY(-50%) translateX(-10px);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    content: '\f054';
    color: #d4af37;
    font-size: 0.8rem;
}

.sidebar a:hover {
    color: #fff;
    background: rgba(212, 175, 55, 0.15);
    border-color: rgba(212, 175, 55, 0.4);
    padding-left: 28px;
    box-shadow: 0 5px 20px rgba(212, 175, 55, 0.2);
    transform: translateX(5px);
}

.sidebar a:hover::before {
    transform: scaleY(1);
}

.sidebar a:hover::after {
    opacity: 1;
    transform: translateY(-50%) translateX(0);
}

.sidebar a.active {
    background: linear-gradient(135deg, rgba(212, 175, 55, 0.25), rgba(218, 165, 32, 0.2));
    color: #fff;
    border-color: #d4af37;
    box-shadow: 0 8px 25px rgba(212, 175, 55, 0.3), inset 0 0 20px rgba(212, 175, 55, 0.1);
    padding-left: 28px;
}

.sidebar a.active::before {
    transform: scaleY(1);
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.6);
}


/* Main content */

.main-content {
    margin-left: auto;
    margin-right: auto;
    max-width: 900px;
    padding: 20px;
    animation: fadeIn 1s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.main-content section {
    background: rgba(0, 0, 0, 0.45);
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 40px;
    box-shadow: 0 0 12px rgba(0, 0, 0, 0.3);
    transition: all 0.4s ease-in-out;
}


/* Tiêu đề section */

.main-content h2 {
    color: #ffd86b;
    margin-bottom: 15px;
    border-bottom: 1px solid rgba(255, 215, 0, 0.3);
    padding-bottom: 6px;
    font-family: 'Playfair Display', serif;
    font-weight: 700;
}


/* Ảnh và video */

.main-content img,
.main-content video {
    width: 100%;
    border-radius: 12px;
    transition: transform 0.3s ease;
}

.main-content img:hover,
.main-content video:hover {
    transform: scale(1.02);
}


/* Hiệu ứng fade-in khi cuộn */

.fade-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-section.visible {
    opacity: 1;
    transform: translateY(0);
}


/* Scrollbar tùy chỉnh */

.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #d4af37, #daa520);
    border-radius: 4px;
    transition: all 0.3s ease;
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.4);
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, #e5c158, #d4af37);
    box-shadow: 0 0 15px rgba(212, 175, 55, 0.7);
}


/* Navbar container layout - DESKTOP */
.site-navbar .container {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    position: relative;
}

.site-navbar .navbar-brand {
    white-space: nowrap;
    margin-right: auto;
}

/* Nút toggle sidebar trong navbar - DESKTOP */
.sidebar-toggle-btn {
    background: linear-gradient(135deg, #d4af37, #daa520);
    border: 2px solid #d4af37;
    border-radius: 8px;
    color: #0a0a0a;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.3);
    font-size: 1.1rem;
    position: relative;
    overflow: hidden;
    margin-right: 15px;
    z-index: 1;
    flex-shrink: 0;
    order: -1;
}

.sidebar-toggle-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.4s, height 0.4s;
}

.sidebar-toggle-btn:hover::before {
    width: 100px;
    height: 100px;
}

.sidebar-toggle-btn:hover {
    background: linear-gradient(135deg, #e5c158, #d4af37);
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.5);
}

.sidebar-toggle-btn.active {
    background: linear-gradient(135deg, #b8860b, #c9a961);
    border-color: #b8860b;
}

.sidebar-toggle-btn i {
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.sidebar-toggle-btn.active i {
    transform: rotate(90deg);
}


/* Overlay khi sidebar mở trên mobile (ẩn đi) */

.sidebar-overlay {
    display: none;
}


/* =============================
   MOBILE OPTIMIZATION - BAIVIET
   ============================= */

/* Tablet */
@media (max-width: 992px) {
    /* Navbar */
    .site-navbar .container {
        padding-left: 10px;
        padding-right: 15px;
    }

    .site-navbar .navbar-brand {
        font-size: 1.4rem;
    }

    /* Sidebar */
    .sidebar {
        width: 260px;
    }

    .sidebar a {
        font-size: 0.95rem;
        padding: 12px 16px;
    }

    /* Toggle button */
    .sidebar-toggle-btn {
        width: 40px;
        height: 40px;
        margin-right: 12px;
        font-size: 1rem;
    }

    /* Main content */
    .main-content {
        padding: 25px 20px;
    }

    .main-content h2 {
        font-size: 1.8rem;
    }

    .main-content section {
        padding: 20px;
        margin-bottom: 30px;
    }
}

/* Mobile */
@media (max-width: 768px) {
    /* Navbar adjustments - LAYOUT ĐÚNG VỊ TRÍ */
    .site-navbar {
        padding: 8px 0;
    }

    .site-navbar .container {
        padding-left: 10px;
        padding-right: 10px;
        display: flex;
        align-items: center;
        position: relative;
        justify-content: space-between;
    }

    /* Spacer giữa brand và toggler */
    .site-navbar .container::after {
        content: '';
        flex: 1 1 auto;
        order: 1;
    }

    .site-navbar .navbar-brand {
        margin-left: 0;
        font-size: 1.2rem;
        flex-shrink: 0;
        white-space: nowrap;
        overflow: visible;
        order: 0;
    }

    /* Toggle button mobile - BÊN TRÁI */
    .sidebar-toggle-btn {
        width: 38px;
        height: 38px;
        margin-right: 10px;
        margin-left: 0;
        font-size: 0.9rem;
        position: relative;
        flex-shrink: 0;
        order: -1;
    }

    /* Navbar toggler (hamburger menu) - CỐ ĐỊNH NGOÀI CÙNG BÊN PHẢI */
    .navbar-toggler {
        flex-shrink: 0;
        padding: 6px 10px;
        order: 2;
        position: relative;
        border-color: rgba(201, 169, 97, 0.5);
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        border-radius: 6px;
    }

    .navbar-toggler:hover {
        background: rgba(201, 169, 97, 0.1);
        border-color: rgba(201, 169, 97, 0.8);
        transform: scale(1.05);
    }

    .navbar-toggler:focus {
        box-shadow: 0 0 0 3px rgba(201, 169, 97, 0.2);
        outline: none;
    }

    .navbar-toggler[aria-expanded="true"] {
        background: rgba(201, 169, 97, 0.15);
        border-color: #c9a961;
    }

    .navbar-toggler-icon {
        transition: transform 0.3s ease;
        display: inline-block;
    }

    /* Rotate icon khi navbar mở */
    .navbar-toggler[aria-expanded="true"] .navbar-toggler-icon {
        transform: rotate(90deg);
    }

    /* Navbar collapse - absolute với animation mượt mà */
    .navbar-collapse {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        width: 100%;
        background: rgba(0, 0, 0, 0.95);
        backdrop-filter: blur(15px);
        z-index: 1000;
        opacity: 0;
        transform: translateY(-10px);
        transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        pointer-events: none;
    }

    .navbar-collapse.show {
        display: block;
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }

    .navbar-collapse.collapsing {
        display: block;
        transition: opacity 0.3s ease, transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    /* Animation cho nav items */
    .navbar-collapse.show .nav-item {
        animation: slideInDown 0.4s ease backwards;
    }

    .navbar-collapse.show .nav-item:nth-child(1) {
        animation-delay: 0.05s;
    }

    .navbar-collapse.show .nav-item:nth-child(2) {
        animation-delay: 0.1s;
    }

    .navbar-collapse.show .navbar-nav:last-child .nav-item:nth-child(1) {
        animation-delay: 0.15s;
    }

    .navbar-collapse.show .navbar-nav:last-child .nav-item:nth-child(2) {
        animation-delay: 0.2s;
    }

    @keyframes slideInDown {
        from {
            opacity: 0;
            transform: translateY(-15px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    /* Sidebar fullscreen overlay style */
    .sidebar {
        width: 100%;
        max-width: 320px;
        box-shadow: 4px 0 40px rgba(0, 0, 0, 0.8);
        padding: 90px 20px 30px 20px;
    }

    .sidebar.active {
        box-shadow: 4px 0 60px rgba(0, 0, 0, 0.9);
    }

    .sidebar a {
        font-size: 1rem;
        padding: 14px 18px;
    }

    /* Sidebar overlay for mobile */
    .sidebar-overlay {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.7);
        backdrop-filter: blur(4px);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 998;
    }

    .sidebar.active ~ .sidebar-overlay,
    .sidebar-overlay.active {
        opacity: 1;
        visibility: visible;
    }

    /* Content container */
    .content-container {
        padding-top: 85px;
        flex-direction: column;
    }

    /* Main content */
    .main-content {
        margin-left: 0 !important;
        padding: 20px 15px;
        width: 100%;
        max-width: 100%;
    }

    .main-content.shifted {
        margin-left: 0 !important;
    }

    .main-content h2 {
        font-size: 1.6rem;
    }

    .main-content section {
        padding: 18px;
        margin-bottom: 25px;
        border-radius: 10px;
    }

    .main-content p {
        font-size: 0.95rem;
        line-height: 1.7;
    }

    /* Images và videos responsive */
    .main-content img,
    .main-content video {
        border-radius: 10px;
    }

    /* Nút Tham quan 3D - XUỐNG DƯỚI CÙNG */
    .nav-item-3d {
        order: 999;
        width: 100%;
        margin-top: 10px;
        border-top: 1px solid rgba(212, 175, 55, 0.2);
        padding-top: 10px;
    }

    .nav-link.tour-3d {
        margin-left: 0;
        display: block;
        text-align: center;
        font-size: 0.95rem;
        width: 100%;
        border-radius: 8px;
        background: linear-gradient(135deg, rgba(212, 175, 55, 0.2), rgba(212, 175, 55, 0.3));
        border: 1px solid rgba(212, 175, 55, 0.4);
    }

    .nav-link.tour-3d i {
        font-size: 1rem;
    }

    /* Đảm bảo các nav-item khác hiển thị trước */
    .navbar-collapse .navbar-nav .nav-item:not(.nav-item-3d) {
        order: 0;
    }
}

/* Mobile nhỏ */
@media (max-width: 576px) {
    /* Navbar compact - ĐẢM BẢO NÚT VÀ CHỮ CÙNG HÀNG */
    .site-navbar {
        padding: 6px 0;
    }

    .site-navbar .container {
        padding-left: 5px;
        padding-right: 8px;
        flex-wrap: nowrap;
    }

    .site-navbar .navbar-brand {
        font-size: 1.15rem;
        letter-spacing: 0.5px;
    }

    /* Toggle button compact - CÙNG HÀNG */
    .sidebar-toggle-btn {
        width: 38px;
        height: 38px;
        margin-right: 8px;
        margin-left: 0;
        font-size: 0.9rem;
        flex-shrink: 0;
        order: -1;
    }

    /* Navbar toggler compact */
    .navbar-toggler {
        padding: 6px 10px;
        font-size: 1rem;
        margin-left: 8px;
    }

    /* Sidebar compact */
    .sidebar {
        max-width: 280px;
        padding: 80px 15px 20px 15px;
    }

    .sidebar a {
        font-size: 0.9rem;
        padding: 12px 15px;
    }

    .sidebar a i {
        font-size: 0.85rem;
    }

    /* Content */
    .content-container {
        padding-top: 75px;
    }

    .main-content {
        padding: 15px 10px;
    }

    .main-content h2 {
        font-size: 1.4rem;
        margin-bottom: 12px;
        padding-bottom: 8px;
    }

    .main-content section {
        padding: 15px;
        margin-bottom: 20px;
        border-radius: 8px;
    }

    .main-content p {
        font-size: 0.9rem;
        line-height: 1.6;
    }

    /* Images và videos compact */
    .main-content img,
    .main-content video {
        border-radius: 8px;
        margin-bottom: 15px;
    }
}

/* Touch optimization */
@media (hover: none) and (pointer: coarse) {
    /* Sidebar links touch-friendly */
    .sidebar a {
        min-height: 48px;
        display: flex;
        align-items: center;
        padding: 14px 18px;
    }

    /* Toggle button touch-friendly */
    .sidebar-toggle-btn {
        min-width: 44px;
        min-height: 44px;
        -webkit-tap-highlight-color: transparent;
    }

    /* Disable hover effects on touch devices */
    .sidebar a:hover {
        transform: none;
    }

    .sidebar a:active {
        background: rgba(212, 175, 55, 0.25);
        transform: scale(0.98);
    }

    .sidebar-toggle-btn:hover {
        transform: none;
    }

    .sidebar-toggle-btn:active {
        transform: scale(0.95);
    }
}

/* Landscape mobile optimization */
@media (max-width: 992px) and (orientation: landscape) {
    .content-container {
        padding-top: 70px;
    }

    .sidebar {
        padding-top: 80px;
    }

    .sidebar-toggle-btn {
        top: 10px;
    }
}